Magnetic separator.



PATENTED JAN: 23, 1906.

H. F. CAMPBELL. MAGNETIC SBPARATOR.- APPLICATION FILEYD J'ULY 29, 1 902.

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H. F. CAMPBELL. MAGNETIC 'SEPARATQR. APPLICATION FILED JULY 29,

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PATENTED JAN. 23, 1906.

H. F. CAMPBELL.- MAGNFTIG SBPARATOR.

APPLICATION FILED JULY 29 1902.

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Series Parallel l I l I I I l I I I 1| I H I I I l I I I I l A UIWU I 555352 1 SESSSSii A w I l I I l I I I I I I I I I I I Paral Z eZ Zqzifiess es Q/am (Me a 'VMW HENRY F. CAMPBELL, or MELROSE,MASSACHUSETTS, 'ASSIGNOR TO NATIONAL MAGNETIC'MINERAL SEPARATING COMPANY, OF BOS- ToN, MASSACHUSETTS, A' oo'RroRArroN or MAINE.

MAGNETIC 'SEPARAT'QR.

Specification of Letters Patent.

Patented J an. 23 190.6

. Application filed July 29, 1902. Serial llo. 117,564

To all whom it may concern.-

Be it known that I, HENRY F. CAMPBELL, of

Melrose, in the 'coun ty of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Magnetic Sep arators, of which the following isa specification.

.This invention relates to apparatus for the extraction of magnetic particlessfrom ore; and the particular object of the present invention is to provide a construction in which the tray or convey'er for conducting the ore past and in proximity to the magnet or magnets shall be not only non-oxidizable and nonmagnetic, but also of a material so light that its inertia or momentum willnot practically interfere to any extent with the rapid-vibrations or shaking to-which it is subjected.

A further objectis to provide means for preventing the magnetic particles from leav ing the tray or carrier prior to reaching the point where they may be lifted by the mag net or magnets into contact with .a belt or other means for removing the magnetic par-. ticles aside from the tray or carrier; and a further object is the production of a machine as a whole which may be conveniently and readily adjusted to vary the inclination of the.

ore tray or carrier without effecting the adjustment of the magnets relatively to said;

carrier.

To these ends the invention consists in the construction and combination of parts, substantially as hereinafter described] and claimed.

In the drawings, Figure 1 isa verticalsec tional view of an ore-separator constructed in accordance with my invention. Fig. 2 is a detail view of a shaker and hopper shown in Fig. 1-. ..Fig. 3 is a detail view of amodification. Fig. 4 is a plan view of the interchangeable circuits of the magnets, the switch being thrown to connect the magnets 1n parallel. Fig. 5 is alike view showing the switch thrown to connect the magnets in series.

The samereference characters indicate the same parts in all the'figures.

Fig. 1 is similar in many respects to one figure of my application'filed May 16, 1901, Serial No. 60,433. i

The framework of'the-apparatus may-be of any desired construction and is here'shown as composed of uprights-'2 and side pieces 3, the said uprights being supported upon a suitthe line 1.

to a fixed cross-piece 39 of the frame.

able base in a manner heremarter described, said base being indicated in the drawings by A shaft 13 is mounted in suitable bearings in the framework and is provided with a pulley .15, driven by a belt 14 from a suitable source of "power, Mounted in suitable bearings at the upper portion of the framework is a shaft 24,-uponwhich are secured three pulleys 20 21 22, said pulleys being of different sizes, substantially as indicated. It is to be understood that the machine carries another set of similar pulleys upon another shaft in the same plane as the shaft 24, and either one of these shafts is driven bysuitable power, so that the belts or carriers 20*, 21 and 22",, which are mounted upon the said pulleys, may be suitably driven in order that the lower stretches of the pulleys or carriers which pass under the magnets, as hereinafter described, Wlll also serve to deliver the magnetic material raised from theshaking-tray at one side of the magnets and tray;

The tray or carrier- 33 for the ore, having side flanges-34 and a fiange'35 at its upper end, is connected, by means of a spider 31, to

a pivot or bolt 32, carried at the outer end of a bracket 30. Below the lower end of the tray or carrier is a gutter 29*, which delivers through a spout 29 into a hopper 28, said hopper 28 receiving the non-magnetic .particles. The lower end ofthe tray is'sup orted so that it may receive a lateral osci lating shaking motion by means of links/36, pivotally connected with a lug 37 on the under side of the tray and with a lug 38, conneplted at oral motion may be imparted to the lower end of the tray by any suitable means, such as a p'itman connected at .40 to a lug 41 on the under side of the lower end ofthe tray. Suitable plates '50, preferably as many in numberas the magnets and carrier-belts, ex'- tend across the tray and move therewith. A series of shutters or distributors 53 are connected to said cross-plates 50 by thumbscrews 52. A receiving-hopper 60, having a spout 62, is suitably supported by the frame.-

work above the upper. end of the tray, said hopper discharging into a box and over an apron ,72, having side flanges 73, onto the tray or-carrier 33. Cross-p1eces 90, carried by the uprights 2 and extending over the bars 92 (only tray are provided with slotted lugs 91' one being shown in under side of the may be simultaneously adjusted vertically.

. The upper or first magnet 100 is connected to the bar 92 by-means .of. a plate. 102 'andbolts .104. This magnet, as in my other .appl1ea- 'tion liereinbefore referredto, is composed a plur'alit or-series of bars of-magnetic material, the ower endsofwhich are connected by a plate-105, along and under which the lower stretch of the belt .pa sses.. The secon'dmagnet 110 is also supported bvthe bar The series of bars of which this ma et 110 is also composed are also provide at their lower ends with a plate 1 1'5,'extend' lengthwise of the series. The arrier elt 21 passes along the under"surface of said plate 1,15.

a", The horseshoe-magnet 120,0.onsisting of two series, ofbars 121,- which are hinged together at 124, is supported at one "means of astrut or struts 144,-the ower ends bars 121 eing indicated V the belt or carrier said plate 129, a

140 re resents a keeper secured at the free.

' ends of t e lower slot 149, through whi h abolt 149 passes cation, SerialNo.

Znon magnetic material, I

rubber or indurated fiber boardis essentially proof against the sulfidsand of which are suitably 7 work. vThe upper bars 121 of this magnet are of different lengths, as described in said earlier a plication, the ends of the longer at. 127. A strip or or along the ends of bars of the magnet, and- 22 rides along and under plate 129 extends across the series of upper bars 121 of the horseshoe magnet, said keeper being secured-to the said bars by holts141. v 143 represents a set-screw passing through one of the portions 3 of the ame and hearing on the under side 'of the keeper 140, whereby the'lower half of the magnet may be adjusted independently of any other adjustmentsof the apparatus.

147, represents a su its lower end connecte the horseshoe-ma net arm 147 is forme to the upper arm of by a bolt 148. This at liiSQlPPGI. end with a into a portion 3 of'the frame. By means of.

this slotted arm 147 the'upper half of the, horseshoe-magnet may be adjusted independently of any other adjustment.

As sofar described the apparatus, as above stated, is or may be the same as in my appli- '60,433, above referred to. The bottom or ore-carrying portionof the tray 33 is composed of a light non-oxidizable such as aluminium. Vulcanized oxidizing chem cals mthe oreand of little are 92-, whereby I .as laminated 'brations to the carrier-belts, so as ortion by connected to the frameporting-arm having tray, and

net next above it.

Wei ht. One of thechiefrequisites of the tab e is a surface that-is smooth and offers little or no obstruction to thepassa e'over it of the fine sharp particles of ore 8 115 which is not-roughened by the same. It is possible that certain woodsmay be found which will measurabl .serve the pur ose of a material if t e same be treated such therefore woul v I my invention. en 7 5 bottom or carrying surface ,may' upon some light structure, such -.wood, the purpose being to have the trayas light as possible, so that its inertia and momentum will not interfere with the rapid shaking thereof by suitable be .within the scope of I desired, the be mounted u v m eans connected with the lug '41, and, fur- 92 by means ofthe plate 112 and bolts 113'.

thermore, a motor of less power is necessary to vibrate or shake the tray when the latteris made of such material as stated. Furthermore,'this lightness of construction tends to I confine the vibrations to the tray or carrier and its immediately-connected parts, and: therefore does not tend to communicate vito have a tendency to shake the magnetic particles therefrom. 4

In the operation of the machine the ore is. placed on the hopper 60 and falls therefrom over the apron 72 onto the rapidly-vibrating tray 33 and gradually moves downward along the latter-between the distributers or shutters 53 to and from the lower end of said tray. Durin the passage of the ore under the magnets t e magnetic particles are liftedfrom ice the ore against the carrier-belts and by means of the latter are discharged into suitable hopers or receptacles, (not shown herein,) all as describedin my said earlier application. 0 preven'-- magnetic particles from being lifted 1o 5 out of the'mass of ore before the latter arrives under the carrier-belts,- I provide a series of septums ct. These septurns are or may be of the same material as the tray 33. They are suitably supportedby or connected with the no tray, as by means of the same thumb-screws 52 which connect the shutters or distributers 53 tothe plates50. The lower edge of the septum extends under the edge of the carrier-- beltwhichis toward the upper end of the 115 from this point the first orupper septum extends sufficiently entirel cut across or interrupt the ma field off the upper magnet 100. Each lower septum has its u per edge, extendin underno neath the edge 0 the carrier-belt of t e mag- In other words, a narrow space isleft between the lower edge of the upper septum and the upper edge of the intermediate septum, through partielesmay be lifted by the first magnet against the carrier-belt 20", and a similar l space or passage is provided between the lower. edge of the intermediate septum and the upper edge of the lower septum for the 1 0 which magnetic r25 upward passage 'ciparticleslifted by the intermediate magnet against the carrier-belt the strip 129.

tends under theupper edge of the carrierbelt 22?, so as to prevent the passage. of mag to. the upper side of point, because the'pow'er ofthe magnet 120 is such that any particles capable of being lifted out of theme by any magneticforce are at.- tracted directly against the carrier-belt 22'.

It will be understood that.the series of sep-T tun s practically constitute a cover for the tray, the spaces between said septums forming transverse openings which are parallel with and adjacent to the two carriers 20 and 21 said openingsbeing of less width thanthewidthiof the carriers, whereby magnetic particles are prevented from being lifted to either side of either of the magnets 100 "and v In orderthat the apparatus as awhole may be varied in its inclination, so that the speed. of the material flowing down the tray 33 may be altered-without varyingthe relative 'posi tions of the tray and magnets, I provide the ugs or. uprights 2 at the righthand .endof the machine shown in therawings with a stron hinged connection I with the base 1 This inge atJtheloWGl 5.

end of each lu" said'rib' fitting asocketc, suitably supported upon the floor orbase 1. i The other end of the machine is provided witho'ne or'uriore brackets d. One

the ore {filancin e, throu h such bracket isshown' as connected" to one of the uprights 2 at the left hand of the 40 Pivotally supported in the bracketd is a nut g, suitably secured to'the floor or base 1. A

hand wheel' h maybe used fol-rotating the screw, and so raising or lowering the supply will'be'readily apparent.

-The apparatus as a wholeis 'one-in which is caused to pass or flowin a lively conditio'njbelo'w the mag'netor magnets.

magnets may be accelerated. or diminished by'means' oi the ad-justment of'the entire ap paratu's' above described. I- am therefore enabled to accurately capabilities of the apparatus according-to the particular ore being treated. This is of particular advantage in anlapparatus which embodies, as in this case, a plurality of ma nets or come er, for the reason that, as above of substantially equal distances above the'tray stated, a

justinent of inclination of the apparatus'will The lower edge ofthelower septum ex .toward which said-mass is movin it. up,'while the violent agitation and from multiple to series at "save'in case of the lower In Figs. 4 ment. whereby the magnets connection mayprovide a rib' b which a screw f passes, the lowermounts end ofthis screw fitting in asocket his animated movement below thethe shaker, the same result follows.

adjust the operative speed I shaker;

varying powers, but having their p'oes at not affect in anyway the relative [powers of the magnets,.which'are fixed in poaidin beating'out or shattering the possibly- 'ffadhering masses of ore,

masses'which may be'drawn against the'un 7 0 because any such j der side of a septum bythe bar of the ma net j wil be drawn with sufiicient force to aid in of the septum with the tray or carrier r'eakin g shaking will im-- mediately dislodge said mass and cause it to work gradually down to below that particular s'eptum.-

Whilmost ores will be effectively treated by the magnets in series, certain refractory ores may rec uire a sity. In-sue case, t

.n ets' may be'changed from 'series'to multip e pleasure. 1 Such be seldom required or most intense magciiang will, however,

net.-

an arrangemay be used and 5 1 1......" shown either in parallel or in series. a wire leading from the source of power to one terminal 202 of'the switch 203. 204represents the retnrn-wireconnectedto terminal 205. 206 representsa series ofterrninalsconreater magnetic inten-J e magnet-windings being su'ch as to permit it, one or all of said ma theica'rrier-belt next 200 represents nected by wires in'parallel' to the several mag nets. In this parallel system is included aresi stance device 207, composed of lamps and resistancecoils. 208 represents a series of terminalsfrom which wires lead to the-ma nets in series. When the switch .203 18 thrown tothpoitionshown in Fig." 4,-the

current-is applied When the switch is thrown'to the position shown in Fig, 5, the current is'applied to the magnets 'inseries and' the resistance 207 is "cut out.

In Figs. 4 an'd5 thelive wires are" represented in 11 lines and the dead wires in dottedlines';

J The angle of the floor of shaker is sharper thanthat of the table, so that the ore is thrown .to .thelowestipoint of the said tures. However small-the quantity of ore in be seen that thelower ends of the feed-pipes f conform to the angle of the shaker-floor or to pressing upon. the floor :of the shaker orthe. block or boss 721',- fixed upon the floor of said shaker. The oscillation of-the shaker. deter-'-' mines the flow of said'ore until thechamber 'of said. sh'akeris partly filled with ore/when H to the magnetsinparalleland the resistance device 207'is in operation. S

- shakerand agaflnstthegate and to theaper- It'will the fiow from the pipes momentarily ceases.

As soon, however, as the flow from beneath the adjustable gate and through the apertures has slightly reduced the ore in the charm ,ber there follows another flow of the ore from the-pipes, 'which'flow is obstructed by the ore in the chamber surrounding theends of said pipes until the volume of said ore is again reduced and the flow succeeds. This intermittent flooding and cessation in the flow of the ore continues While the machine is,

- in operation and ceases when the machine stops, with no danger of overflow. It is self limiting or determining. A nearly uniform across its surface.

' tray or conveyer.

depth of ore is'maintained in the chamber,

and, more important-still, a uniform pressure of ore is maintained at the line where said ore issues beneath the gate through. the several apertures and uponthe apron'of the shaker, thereby securing a flow of ai'predetermined film of uniform depth and constant in (warm the separator and tity upon the table of I have so constructed and arranged the upper poles of thelhorseshoe-magnet 120 that each is providedwith sharp corners, the lower one of which is presented to .the tray or 'conveyer and to the material passing over it.'

The face'ofeach pole lies in a plane whichforms an acute angle with.thesurface of-the The effect of this arran e- -ment is that the materialin passing under t e poles of the horseshoe-magnet travels through a magnetic field of graduallvincreasin' intensity-. As the material eritersthe fie d of this magnet it is first infiuenced'by the mags netic are formed between the faceof the poles 127 and the underpoles. Thisis not suificient to lift the magnetic particles from the tray. It serves to polarize them in advance of their arrival under 'the lower'corner of the poles 127 and prepare them for the most effective work of the magnet. The lower corner being a sharp angle andneare st the tray creates the 'most. intense portion ofthe arc, immediately beyond which the material leaves the magnetic field and the nori-magi netic material is discarded. It is'obvious" that the'lower poles of. the magnet can be formed and arranged in a similar manner, so

as to present a sharp corner nearest to the:

surface of the tray, and similar advantages. would be thereby attained. I do not,'.how-

ever, herein claim a magnetic separating device arranged to remove magnetic particles from a mass of ore, a tray .or conveyer arranged to conduct the ore, and magnets-having a pole or poles arranged in relation to the tray, so as to'form amagnetic field or gmdu ally-inereasin intensity across the 'path of the ore upon 51% conveyer and oi greatest intensity at'the point where the :ore emerges "from the magnetic field, as the same form the subject-matter of my applicatiornfiled f February 12, 1903, Serial No. 143,012.

Having thus explained the natureof my said invention and described a way of con-' structing and using the same althoh without-having attempted to set forth a l of the forms in-which it may be embodied or all of the modes of its use, I declare that what I claimis.. V 1

The-combination in a'magnetic separator, ofjarnagnet'; a tray, presenting an unobstructed surface" at a duedistance below the magnet, for supporting and conveyinglthe materials read in a film ofsubstantialiy uniform thic essunder andpast the magnet, and through an uninterrupted field of-such magnet,- a cover for said tray-"for preventing the passage of magnetic particles to the sides of the magnet, and means for imparting a" movement to' the said evice, magnets furnished makingl such cha'ngaand means for carrying eparticles removed.

3. The combination in a magneticseparator, ofra magnet; means, presenting an un- -obstructed surface at a due-distance below Y aside t thermagnet; fonsupporting and conveym the mater'ial underand past the magnet, an through an uninterrupted field of such magnet,';.and-to pa'ss'it, spread in a film of substantially uniform thickness on the surface beneath the magnet, a vibrating shaker for A delivering the material to-t'he said. conveying f means,-said shaker having a boss, a hopper arranged over said shaker and having a pipe the delivering en'cl 'of which terminates over and close to the top of said boss, and means for causing the particles of "ore to be mechanically a "tated under the magnet in a direction other t an that ofthe travel of the-ore In testimony whereof -I have aflixed my a signature in' presence of twowitnesses,

" HENRY; F.v CAMPBELL. Witnesses: I

A. D. HARRISON, GEORGE Pnzznr'rn IIO 

